This is what I have found with Blood Frenzy. 1. It is partially broken. I do notice slight increase in Flurries2. It does not increase damage. You dont get 20% or 40% or even 1%.3. It doesn't matter whether you are buffless or have Emphatic fury running. It provides no increase in damage. 4. Overall a big waste of AA's unless they fix it. It is not fixed.